Admin session expiration error in HDP AMBARI CONSOLE

[#1]

It never happened before but since I played with Kerberos I am getting this message every few mins in Ambari

[#2 · Accepted solution]

@Sami Ahmad the format for kerberos principal is primary/instance@REALM. For admin principals typically the instance is admin. If the REALM is not specified than the default one will be used. Try passing admin/admin into the "Admin principal" field.

[#3]

you misunderstood me , i have no issue logging in, its just that it logs me out after every few mins or if try to start some service inside the ambari console . There is no problem with username or password.

[#4]

ok I reset the KDC credentials via the Manage KDC credentials button and I entered principal as admin/admin.

now I am not getting locked out but if I try to reinstall KMS I am getting t he error below .. he is not finding the krb5.conf file . is there a setting in Kerberos which is messed up ? since as I stated earlier the TGT system is working fine on the command level for HIVE n HBASE ?

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23 Dec 2016 22:16:33,131  WARN [ambari-client-thread-837] ServletHandler:561 - Error Processing URI: /api/v1/clusters/FDOT_Hadoop/hosts/hadoop1.abc.com/host_components/RANGER_KMS_SERVER - (java.lang.RuntimeException) Update Host request submission failed: org.apache.ambari.server.AmbariException: The 'krb5-conf' configuration is not available
23 Dec 2016 22:16:33,131  WARN [ambari-client-thread-837] ServletHandler:561 - Error Processing URI: /api/v1/clusters/FDOT_Hadoop/hosts/hadoop1.abc.com/host_components/RANGER_KMS_SERVER - (java.lang.RuntimeException) Update Host request submission failed: org.apache.ambari.server.AmbariException: The 'krb5-conf' configuration is not available

[#5]

@Sami Ahmad

Could you please try restarting your ambari server once?

Once restarted, can you run service check for kerberos?

Kerberos service check prompts a window where you need to enter your admin credentials for your kerberos.

[#6]

I don't see any button to do the "service check " how can I run this check ?